2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 113Get this manual
Power unit
9Similarly, check the valve clearance of cylinders #1, #2, and #3 in order, and be sure to turn the flywheel magnet 120 clockwise each timeAdjust if out of specification
NOTE: Do not turn the flywheel magnet counterclockwise4Check the intake and exhaust valve clearance for cylinder #45Turn the flywheel magnet an additional 120 clockwise and align the "2TDC" mark on the flywheel magnet with the pointer b6Check the intake and exhaust valve clearance for cylinder #57Turn the flywheel magnet an additional 120 clockwise and align the "3TDC" mark on the flywheel magnet with the pointer b8Check the intake and exhaust valve clearance for cylinder #6NOTE: Check the valve clearance when the engine is cold Note the measurementValve clearance: Intake i: 0.20 0.03 mm (0.008 0.001 in) Exhaust j: 0.34 0.03 mm (0.013 0.001 in)